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SHERLOC is an arm-mounted fluorescence and Raman spectrometer that was recently selected to be part of the payload for the next proposed NASA rover mission to Mars, scheduled for launch in 2020. SHERLOC enables non-contact, spatially resolved, high sensitivity detection and characterization of organics and minerals on the Martian surface. The investigation goals are to assess past aqueous history,...
We have developed a new technique that uses Raman spectra obtained from multiple DUV excitation wavelengths for explosive detection. The strong dependence on excitation wavelength of the Raman signal provides a unique signature, improving specificity.
We quantitatively modeled the volume phase transition of a hydrogel containing a crystalline colloidal array with a crown ether ligand which binds Pb2+. The hydrogel volume response and the wavelength diffracted depend on the Pb2+ concentration and on both the ionic strength and the valence of the nonbinding ionic species. We successfully modeled the response of this hydrogel Pb2+ sensor to ionic...
Abstract. We have developed intelligent polymerized crystalline colloidal array (IPCCA) chemical-sensing materials for detection of Pb2+ in high ionic-strength environments such as body fluids with a detection limit of 500nmolL1 Pb2+ (100ppb). This IPCCA lead sensor consists of a mesoscopically periodic array of colloidal particles polymerized into an acrylamide hydrogel. The array Bragg-diffracts...
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